WO2009026031A3 - Method and apparatus for controlling power transmission levels for a mobile station having transmit diversity - Google Patents

Method and apparatus for controlling power transmission levels for a mobile station having transmit diversity Download PDF

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Publication number
WO2009026031A3
WO2009026031A3 PCT/US2008/072858 US2008072858W WO2009026031A3 WO 2009026031 A3 WO2009026031 A3 WO 2009026031A3 US 2008072858 W US2008072858 W US 2008072858W WO 2009026031 A3 WO2009026031 A3 WO 2009026031A3
Authority
WO
WIPO (PCT)
Prior art keywords
transmit diversity
exceeded
communication device
mobile communication
sar
Prior art date
Application number
PCT/US2008/072858
Other languages
French (fr)
Other versions
WO2009026031A2 (en
Inventor
William P Alberth
Original Assignee
Motorola Inc
William P Alberth
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc, William P Alberth filed Critical Motorola Inc
Publication of WO2009026031A2 publication Critical patent/WO2009026031A2/en
Publication of WO2009026031A3 publication Critical patent/WO2009026031A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
  • Transmitters (AREA)

Abstract

A mobile communication device (100) of the embodiments will have a transmit diversity antenna system (613) that will comprise at least two antennas and processor/s (607) that will run a transmit diversity control module (609) for controlling transmit diversity output power. Using a power curve, the mobile communication device (100) determines whether a threshold, corresponding to an SAR value, is or may be exceeded. If the SAR threshold is not exceeded given various determined environmental conditions, the mobile communication device (100) continues transmit diversity operation. However, if SAR is about to be exceeded, or is exceeded, the mobile communication device (100) will take action and either reduce overall power, reduce power to one of the transmit diversity antennas, or deactivate one of the transmit diversity antennas in order to bring the SAR level back below the threshold.
PCT/US2008/072858 2007-08-16 2008-08-12 Method and apparatus for controlling power transmission levels for a mobile station having transmit diversity WO2009026031A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/840,128 US20090047998A1 (en) 2007-08-16 2007-08-16 Method and apparatus for controlling power transmission levels for a mobile station having transmit diversity
US11/840,128 2007-08-16

Publications (2)

Publication Number Publication Date
WO2009026031A2 WO2009026031A2 (en) 2009-02-26
WO2009026031A3 true WO2009026031A3 (en) 2009-04-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/072858 WO2009026031A2 (en) 2007-08-16 2008-08-12 Method and apparatus for controlling power transmission levels for a mobile station having transmit diversity

Country Status (2)

Country Link
US (1) US20090047998A1 (en)
WO (1) WO2009026031A2 (en)

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